class animal:
    def __init__(self, species, sound):
       if species in ['晏强斌', '狗', '羊', '猴子', '老虎', '大象']:
          self.species = species
          self.sound = sound
       else:
          self.species = None
          self.sound = None
    def speak(self):
       if self.species == None:
          print('动物园里没有动物，游戏结束！')
          return False
       else:
           print(self.species, self.sound)
           return True
print('动物园里有什么？')
flag = True
while flag:
    s = input('请输入动物种类和叫声 (使用空格隔开):')
    list1 = s.split(' ')
    animal = Animal(list1[0], list1[1])
    flag = animal.speak()

